The environmental benefits of a two-stage gas generator cannot be ignored. Below we illustrate this point from two gas systems.
Cold gas system: When using a single-stage furnace, the cold gas system requires a large amount of washing water, about 12t/1000Nm3, and the phenol content in the circulating water is greater than the prescribed emission standard, so it cannot be discharged directly to the outside, which brings difficulties to the treatment of this part of toxic phenol-containing wastewater. In addition, tar residue will be produced. When using a two-stage gas generator, only a small amount of fresh water, about 0.3t/1000m3, is added to the circulating water system, and the reuse rate of this part of the circulating water is 95%, and no tar residue is produced, thus reducing environmental pollution.
Hot gas system: When using a single-stage furnace, due to the large amount of dust in the gas, the heavy tar condensed in the gas is mixed together and adheres to the inner wall of the hot gas pipe, forming a thick layer of sticky and hard attachments that is difficult to blow off or scrape off. Under normal circumstances, after 3 months of operation, the inside of the pipe The resistance increases significantly. The gas pressure can be reduced by about 40%-50% from the outlet of the gas furnace to the gas exchanger. Therefore, on average, the gas pipe needs to be burned once every 3-4 months. Each time the pipe is burned, it takes one shift, which will affect the normal production of 3-4 shifts and pollute the environment. And adoptTwo-stage gas generatorBecause the dust content in the gas is less and there is basically no tar, even during operation, some soot will be deposited on the inner wall of the hot gas pipe. However, this part of the soot is loose and easy to remove.
Many single-stage gas stations have to accept fines every year due to environmental pollution caused by phenolic water and tar residue.